Azo dyes



Other objects will appear hereinafter. of the products falling Within the invention and 65" These objects are accomplished by producing how they may be prepared. The proportions new compounds having the following probable given are in parts by weight. formula: Example 1.-The aminoazo compound pre- X pared, as hydrochloride, from 248 parts of paraamino-dibutyl-benzamide and 153 parts of ami- 70" N(Z R N=N"R N=N R no-hydroquinone-dimethyl-ether is stirred with Y 6000 parts of water and diazotized with parts UNI-TED STATES PATENT OFFlCE AZO DYES Harold Edward Woodward, Penns Grove, N. J.,

assignor to E. I. du Pont de Nemours & Company, Wilmington, Del., a corporation of Delaware No Drawing. Application December 1, 1931 Serial No. 578,420

12 Claims. (Cl. 26083) This invention relates to new chemical comtizing the resulting amino azo compound and pounds, and more particularly to the produccoupling with a naphthol or naphthol derivative tion of new azo dyes containing no sulfonic or containing no sulfonic or carboxylic groups. ,carboxylic groups. While the invention is susceptible of con- One of the objects of the invention is the pro siderable variation and modification in the manduction of new compositions of matter. A furner of its practical application, particularly as ther object is the production of new dyes valuregards the nature and proportions of materials able for the coloring of organic liquids, especially used and conditions of temperature, volumes, hydrcarbons and halogenated hydrocarbons. etc., the following examples will illustrate some of hydrochloric acid (100%) and 76 parts of 111 which R 1s an aromatic radical residue or o sodlum nitrite at 10 C. for one hour. The brown 20 5322 222??? gfgfg g ii g ggi g solution of the diazo comp gund filteredtancfl added at 5-10 C. to a solu ion 0 152 pa s o gg z i gwgiz gg i i g g fig 2; beta-naphthol, 4 t parts of sodium hydroxide and of the benzene or naphthalene series with the 106 parts sodium carponafte 2500 parts water. When the coupling is finished the dyeazo groups para to each other having no sulo stuff 13 filtered at 40 C., Washed and dried. The 101110 01 caiboxyhc groups, and preferablyconpmduct is a M a ck powder, oluble in water tammg as subs-mguent one or more membeI-S but soluble in many organic liquids with a bluof the group consisting of alkyl and alkoxy radicals; R is a naphthol or naphthol derivative lsh'red color The m t absorptlon of l.1ght

30 having no sulfomc or carboxylic groups and in its gasoline solutlon is at about 550 millimiproferably containing as a substituent at least Crons- The l tuglontof tlhfis dyelisrepresentone of the members of the group consisting of ed by the fol owmg 5 rue um ormu --NH2, -CONH-alkyl, --CONH aryl, CON (al- OCH; CH kyDz, and o 35 f (O4Hn)2N- O-N N aryl OH;

40 X is an alkyl group or hydrogen; Y is an alkyl or Emmple ammoazo compound 5 an aryl group; Z 15 group whlch may be pared as the hydrochloride from 230 parts of 9 2-amino-anisol-5-dimethyl-sulfonamide and 173 l=O, parts of 1-amino2 naphthol-methyl-ether is stirred with 6000 parts of water and diazotized 45 l with 55 parts of hydrochloric acid and 100 '76 parts of sodium nitrite at 10 C. for one hour. The diazo compound is added at 5-10 C. to :3. These compounds are obtained by diazotizing solution of 152 parts of p h l, 4 parts an amino-aryl carboxylamide derivative or an of Sodlum hydroXlde and 106 parts of SOdlum 50 amino-aryl sulfonamide derivative containing no carbonate in 2500 parts or" water. When the sulfonic or carboxylic groups, coupling the recoupling is complete the dyestuff is filtered at sultant product with an aromatic amine of the 50 0., washed and dried. It is a black powder, benzene o-r naphthalene series which can couple soluble in organic solvents with a blue-violet in the position para to the amino group and color, the maximum absorption of light of its 55 contains no sulfonic or carboxylic groups, diazosolution in gasoline being at about 580 millimino Water.

crons. Its constitution may be represented by the following structural formula:

(1)011 OCH: (|)H Example 3.The aminoazo compound pre- 10 pared as the hydrochloride from 248 parts of para-amino-dibutyl-benzamide and 173 parts of 1-amino-2-naphthol-methyl-ether is stirred with 6000 parts of water and diazotized with parts of hydrochloric acid (100%) and 76 parts of sodium nitrite at 10 C. for one hour. The brown solution of the diazo compound is filtered into a solution of 277 parts of 2-hydroxy-3-naphthanilide and 80 parts of sodium hydroxide in 400 parts of alcohol (95%) and 500 parts of The coupling is made at 10 C. and the resultant product is then filtered at 55 C., washed and dried. The product is a dark blue powder, soluble in organic solvents with a blue color. The maximum absorption of light in its gasoline 25 solution is at about 590 millimicrons. The structural formula of this dye may be represented as follows:

first components employed are pamino-dibutylbenzamide, Z-amino-anisol 5 -dimethyl-sulfonamide, p amino dimethyl benzamide, metaamino-dimethyl-benzamide, para amino benzanilide, para amino benzoyl ethylaniline, 2 amino toluene 4 dimethyl sulfonamide, 2 amino-anisol-4-dimethyl-benzamide and other dialkylamides of amino-benzoic acids, anisidine, aniline, toluidine, or xylidine sulfonic acids. In general, the lowest melting amino dialkyl benzamides are preferred, and especially dibutylbenzamide.

Second components giving especially desirable results are: amino hydroquinone dimethyl ether, 1-amino-2-naphthol-methyl-ether, cresidine, alpha-naphthylamine, l-amino '7 naphthol, l-amino-naphthyl-S- fonamide and other alpha-naphthylamine derivatives which can couple in the 4- position and contain no carboxylic or sulfonic groups.

As last components, beta-naphthol, 2-hydroxy- S-naphthanilide, 1 amino 7 naphthol, 2 hydroxy 3 ethyl naphthamide, 2 hydroxy 3 phenyl-ethyl -naphthamide, 2 hydroxy 3 dibutylnaphthamide are preferably employed.

Throughout the specification and claims, it will be understood that by aryl group is meant an or 'I-dimethyl-sulwith a green color.

Example 4.--The aminoazo compound prepared as the hydrochloride from 164 parts of para-amino-dimethyl-benzamide and 173 parts of 1-amino-2-naphthol-methyl-ether is stirred with 6000 parts of water and diazotized with 55 I parts of hydrochloric acid (100%) and 76 parts of sodium nitrite at 10 C. for one hour. The soluble brown diazo compound is filtered into a solution of 167 parts of 1-amino-7-naphthol, 44 parts of sodium hydroxide and 106 parts of sodium carbonate in 4000 parts of water. The temperature of this coupling is 5-10 C. After coupling is complete the insoluble color is filtered at '75 C. The product is a black powder very insoluble in water but soluble in organic solvents Its gasoline solution shows a maximum absorption of light at about 610 millimicrons. Its constitution is probably as shown in the following structural formula:

(IJCH3 on NHr- It will be understood that the specific examples of dyes and methods of preparing them which are given above are not intended to limit the scope of the invention. As previously indicated,

.the method of preparation may be modified considerably as to volumes, temperatures, and other conditions Without greatly affecting the results obtained. Any other amino-aryl carboxylamide or sulfonamide containing no sulfomc or car- 'gg boxylic groups may be employed as a first component. Likewise, other members of the benzene and naphthalene series as defined by R. and R" in the general formula may be employed as second and last components, respectively.

Especially good results are obtainable when the aromatic radical of the benzene series; by alkyl group is meant an acyclic radical derived from a hydrocarbon by the elimination of one atom of hydrogen, such as, for example, CH3, C2H5, etc.; and by alkoxy is meant an acyclic oxy-alkyl radical of the type -OCH3, -OC2II5, or other acyclic ether radical.

Compounds produced in accordance with the present invention are especially valuable for coloring organic liquids and solids, particularly hydeparting from the spirit thereof, it is to be understood that I do not limit myself to the foregoing examples or description except as indicated in the following claims.

I claim:

1. A chemical compound having the probable general formula:

Their tinctorial power is suchwherein R is an aromatic radical of the benzene I I series containing no sulfonic or carboxylic groups, R is an aromatic residue of the benzene or naphthalene series with the azo groups para to each other and containing no sulfonic or carboxylic radical and an aromatic radical of the benzene series, and Z is a member of the group consisting of 2. The chemical compound set forth in claim 1 wherein R contains as a substituent one or more members of the group consisting of alkyl and alkoXy radicals.

3. The chemical compound set forth in claim 1 wherein R" contains as a substituent one of the members of the group consisting of Nl-Iz, CONH alkyl, CONH aryl, CON(alkyl)z or alkyl aryl i. The chemical compound set forth in claim 1 wherein R contains as a substituent an alkoxy radical.

5. A chemical compound having the general formula set forth in claim 1, wherein R is an aromatic radical of the benzene series containing no sulfonic or carboxylic groups, R is an aromatic radical of the benzene or naphthalene se ries with the azo groups para to each other, having no sulfonic or carboxylic groups and containing as a substituent one or more members of the group consisting of alkyl and alkoxy radicals, R is a naphthol containing as a substituent a member of the group consisting of NH2, CONH alkyl, CONH aryl, CON(a1kyl)2 or alkyl C O N aryl X is a member of the group consisting of an alkyl radical and hydrogen, Y is a member of the group consisting of an alkyl radical and an aromatic radical of the benzene series, and Z is a member of the group consisting of 6. The chemical compound set forth in claim 1, wherein Z is the radical X and Y are alkyl groups, and R contains as a substituent at least one alkoxy group.

7. A chemical compound having the formula:

OOH:

8. The process of preparing a disazo dye which comprises diazotizing a member selected from the group consisting of amino-aryl carboxylamides and amino-aryl sulfonamides containing no sulfonic or carboxylic groups, coupling the resultant product with an aromatic amine of the benzene or naphthalene series which can couple in the position para to the amino group and contains no sulfonic or carboxylic groups, diazotizing the resulting amino azo compound and coupling with a naphthol containing no sulfonic or carboxylic groups.

9. The process of preparing a disazo dye which comprises diazotizing an amino benzamide containing no sulfonic or carboxylic groups, coupling the resultant product with an alpha naphthylamine which can couple in the 4- position and contains as a substituent at least one alkoxy group, diazotizing the resulting aminoazo compound and coupling with a naphthol containing as a substituent a member of the group consisting of NH2, -CONH alkyl, CONH aryl, --CON(alkyl)z and alkyl in which R represents a benzene nucleus containing no sulfonic or carboxylic groups but which may have substituted thereon one or more members of the group consisting of alkyl and alkoxy radicals, R represents a benzene or naphthalene nucleus with the azo groups para to each other and containing no sulfonic or carboxylic groups but which may have substituted thereon one or more members of the group consisting of alkyl and alkoxy radicals, R" represents a naphthol nucleus containing no sulfonic or carboxylic groups but which may have substituted thereon a member selected from the group consisting of NH2, CONH alkyl, CONH aryl, -CON- (alkyDz, and

alkyl ooN aryl X represents hydrogen or an alkyl radical, Y rep- I on CONE-O N-Z-R-NHz in which R represents a benzene nucleus containmg no sulfonic or carboxylic groups but which may have substituted thereon one or more members selected from the group consisting of alkyl and alkoxy radicals, X represents hydrogen or an alkyl radical, Y represents an alkyl or an aryl groups but which may have substituted thereon radical of the benzene series, and Z represents a member selected from the group consisting of or =SO2, then coupling the resultant diazo -NH2, CONH alkyl, --CONH aryl, -CON- salt in a position para to the amino group of an (alkyDz, and

aromatic amine of the benzene or naphthalene alkyl series, which amine may contain one or more members selected from the group consisting of CON alkyl and alkoxy radicals, but contains no sulyl fonic or carboxylic groups, diazotizing the result- 10 ant aminoazo compound and coupling it with a HAROLD E WOODWARD naphthol containing no sulfonic or carboxylic 

